CN107166971A - Sinter the low NO of flue gas recirculationxDischarge technology - Google Patents
Sinter the low NO of flue gas recirculationxDischarge technology Download PDFInfo
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- CN107166971A CN107166971A CN201710443524.1A CN201710443524A CN107166971A CN 107166971 A CN107166971 A CN 107166971A CN 201710443524 A CN201710443524 A CN 201710443524A CN 107166971 A CN107166971 A CN 107166971A
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- flue gas
- sintering
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- flue
- bellows
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
Abstract
Flue gas recirculation low NOx drainage technique is sintered the present invention relates to one kind, technical scheme includes sintering flue gas and enters flue through the bellows below sinter bed, bed material, sintering pallet bottom double-edged fine-toothed comb, chassis, mixed from the be rapidly heated sintering flue gas ammonia that vaporizes formation at high temperature with the liquefied ammonia and liquefied ammonia of penetrating in bellows in section region of tail section and flue gas, into flue collector after generation denitration reduction reaction under catalytic action；Sintering flue gas from head section is drawn after being collected through corresponding bellows by circulating flue gas flue collector, send into the circulating flue gas cover above sintering pallet, sinter bed is again introduced under the draft effect of high pressure positive blower, participates in sintering process and reduce after denitration to be again introduced into bellows through chassis double-edged fine-toothed comb.Present invention process flow is simple, not outsourcing catalyst realizes that good, environmentally friendly effective denitration, controllability, low equipment investment, operating cost are low, and can effectively remove the NOx in outer row's sintering flue gas.
Description
Technical field
The present invention relates to the flue-gas denitration process of field of Environment Protection, specifically a kind of sintering flue gas recirculation low NOx drainage
Technique.
Background technology
Steel industry smoke pollution be one of main source of China's atmosphere pollution, " 12 " though during steel industry
Sintering flue gas desulfurization is completed, but denitration work is just at the early-stage, and more ripe SCR denitration technologies are due to catalytic denitration temperature window
The restriction of mouth, denitrification apparatus investment and operating cost are higher, and one-time investment cost is high, and (wherein catalyst cost accounts for investment assembly
This 30-40%)；Temperature window it is general between 350-450 DEG C, it is necessary to consume a large amount of heat energy to flue gas, it is extra to increase
The operating cost of SCR denitration is added.Low-temperature denitration catalyst is mostly noble metal, and its cost is higher, and easily occurs oxygen inhibition
And sulfur poisoning.Even if the catalyst for developing inexpensive, low temperature window is catalytic-reduction denitrified to sintering flue gas progress SCR, its
Function can only also remove NOx, for sintering the purification overall process of flue gas, and the removing of every kind of pollutant, which need to be corresponded to, builds one
Facility is covered, the pollutant removal function of each independent facility is single, causes flue gas purification system process route long, floor space is big,
Control is complicated.
In order to reduce the scale of flue-gas cleaning devices, assistant rattan legendary ruler of great antiquity, the first of the Three August Ones's political affairs etc. have been carried out the research of sintering flue gas recirculation, will sintered
Flue gas partial circulation is again introduced into sintering machine, can obviously reduce the discharge capacity of waste gas, and emission reduction 25-50% can be achieved, with weight
Big environmental and social benefits.But the property that the flue gas recirculation carried out at present is not directed to flue gas carries out subregion, sub-prime circulation, section
Energy and emission reduction effect be not obvious, so that the country does not popularize application in an all-round way also.
Analysis, its flue gas physical property of sintering machine different zones and composition are tracked by the flue gas to sintering machine different zones
Difference is larger, as shown in Fig. 1-1, Fig. 1-2, Fig. 2-1, Fig. 2-2, is rapidly heated a section early stage in flue gas, such as 9, before No. 10 bellows
(bellows numbering presses both sides serial number, the big corresponding head of numeral, small corresponding tail), flue-gas temperature is low, and NOx concentration is high；
After the section that is rapidly heated (9, No. 10 bellows after), flue-gas temperature is high, and NOx concentration is low.
On the other hand, Yao etc. has found γ-Fe2O3To NH3- SCR denitration has stronger activity, and 95% is issued at 250 DEG C
Optimal denitration efficiency.Wang Fang etc. also demonstrates iron ore to low concentration of NO in flue gasxCatalysis reduction characteristic.Pin is in this regard, originally
Technology utilizes ferrous oxide multicomponent concerted catalysis in sintering deposit to act on, and the flue gas in the middle part of sintering machine is rapidly heated section, to
Penetrating ammonia in bellows, is acted on using the dust in flue gas rich in the denitration catalyst that ferrous oxide multicomponent has, and temperature
Degree is more than 300 DEG C, and high temperature (denitration temperature window) waste heat for realizing sintering dust and flue gas makes full use of and synchronous denitration
Purpose.Meanwhile, sintering machine is guided into the flue gas recirculation for section early stage that is rapidly heated and is rapidly heated a section back segment, is again introduced into sintered
Journey, had both saved the investment of denitration device, also eliminated outsourcing denitrating catalyst.
The content of the invention
The invention aims to solve above-mentioned technical problem, the flue gas pollutant produced for sintering machine different zones
There is provided a kind of technological process for different response characteristics in the sintering deposit or the sintered compound bed of material of concentration difference and different zones
Simply, not outsourcing catalyst realizes that good, environmentally friendly effective denitration, controllability, equipment investment, operating cost are low, and can have
Imitate emission reduction NOx sintering flue gas recirculation low NOx drainage technique.
Technical scheme includes sintering flue gas under the draft effect of high pressure positive blower through sinter bed, bed material, sintering board
Bellows below underbody portion double-edged fine-toothed comb, chassis enter flue, and sintering machine is divided into igniting section, machine along chassis direct of travel
Head section, flue gas be rapidly heated section and tail section 4 regions, igniting section be located at sintering machine foremost, the region accounts for 1-2 bellows；
Head section is located at the sintering machine first half after igniting section and extended in the middle part of sintering machine, and the region accounts for sintering machine total length
35- 45%；Flue gas is rapidly heated section positioned at sintering machine middle part tail direction partially, and the region accounts for 2-4 bellows；Tail section
In the latter half of of sintering machine, the region accounts for the 35-45% of sintering machine total length；200 DEG C of tail section sintering flue-gas temperature ＞, NOx
Concentration ＜ 100mg/Nm3；Flue gas be rapidly heated section sintering 80-200 DEG C of flue-gas temperature, NOx concentration ＞ 100mg/Nm3；Head section
Sinter 80 DEG C of flue-gas temperature ＜, NOx concentration 300mg/Nm3More than；80 DEG C of section of lighting a fire sintering flue-gas temperature ＜, NOx concentration ＜
100mg/Nm3, the flue includes flue collector and circulating flue gas flue collector, is quickly risen from tail section and flue gas
The ammonia that the sintering flue gas in temperature section region vaporizes formation at high temperature in bellows with the liquefied ammonia and liquefied ammonia of penetrating is mixed,
Occur to enter flue collector after denitration reduction reaction under the ferrous oxide catalytic action that sintering soot dust granule thing is rich in；From described
The sintering flue gas of head section is drawn after being collected through corresponding bellows by circulating flue gas flue collector, above feeding sintering pallet
In circulating flue gas cover, sinter bed is again introduced under the draft effect of high pressure positive blower, sintering process is participated in and reduces after denitration
It is again introduced into through chassis double-edged fine-toothed comb in bellows.
The circulating flue gas cover is arranged on directly over sintering machine, and covering rear of sintering machine section and flue gas are rapidly heated section.
Rear of sintering machine section and flue gas are rapidly heated on the bellows side wall below section region and circumferentially install at least one
Layer liquefied ammonia nozzle, by nozzle spray into liquefied ammonia enter bellows and be vaporized into ammonia with sintering flue gas mix, sinter flue gas in richness
Occurs denitration reaction with the NOx in flue gas under the catalytic action of iron content system polyoxide.
The liquefied ammonia nozzle ejiction opening that tail section and flue gas are rapidly heated on the bellows side wall below section is tilted upward, and is made
Liquefied ammonia is sprayed on pallet bottom double-edged fine-toothed comb, or makes liquefied ammonia emission direction and sintering flow of flue gas in opposite direction, or two directions angle
More than 90 degree.
The flue gas that the flue collector is drawn is sent into follow-up electrostatic/cloth bag after cooling through circulating flue gas heat exchanger indirect heat exchange and removed
In dirt device.
The flue also includes head igniting section flue, and the sintering flue gas from the igniting section is by corresponding wind
Case is directly led out after collecting to be entered in follow-up electrostatic/sack cleaner through head igniting section flue.
Sintering flue gas from circulating flue gas flue collector first enters circulating flue gas after circulating flue gas deduster dedusting and exchanged heat
Circulating flue gas cover is sent into after the flue gas indirect heat exchange that device is introduced with circulating flue gas flue collector.
Inventor's analysis finds, pollutant concentration is not in sintering flue-gas temperature and flue gas that sintering machine different zones are produced
Together, 200 DEG C of tail section sintering flue-gas temperature ＞, NOx concentration ＜ 100mg/Nm3；Flue gas be rapidly heated section sintering flue-gas temperature
80-200 DEG C, NOx concentration ＞ 100mg/Nm3；80 DEG C of head section sintering flue-gas temperature ＜, NOx concentration 300mg/Nm3More than；Point
Fiery 80 DEG C of section sintering flue-gas temperature ＜, NOx concentration ＜ 100mg/Nm3If directly all sintering flue gases all sent without difference
Enter mixing in flue, then can make the flue dust temperature drop in flue collector, influence sintering flue gas is in high-temperature flue gas flue collector row
Reduction denitration reaction in entering.The flue is divided into flue collector, circulating flue gas flue collector and head igniting section cigarette accordingly
Road, from tail section and flue gas be rapidly heated section sintering flue-gas temperature it is higher, therefore can be mixed with liquefied ammonia in the bellows of lower section
Close, create the temperature for meeting denitration reaction, raw material and catalysts conditions, it is direct that this partial fume is not mixed into other low-temperature flue gas
Flue collector is sent into, can also continue to occur denitration reaction in follow-up flue collector；Sintering flue-gas temperature from head section is low
And NOx concentration is higher, during the processing of this partial fume denitrating, denitration temperature window need to be heated to, high energy consumption also needs outsourcing to take off
Denox catalyst, processing cost is big, is drawn after this partial fume is collected through corresponding bellows separately through circulating flue gas flue collector,
Inventor is dexterously sent into the circulating flue gas cover above sintering pallet, and burning is again introduced under the draft effect of high pressure positive blower
Ramming material layer, participates in sintering process and reduces after denitration to be again introduced into bellows through chassis double-edged fine-toothed comb；By the way that circulating flue gas cover is pacified
Directly over the sintering machine, covering rear of sintering machine section and flue gas are rapidly heated section, this partial fume is transmitted back to temperature highest
Rear of sintering machine section and flue gas be rapidly heated a section region, such technique effect is mainly：1. the cigarette of the high NOx concentration of head section
Gas is recycled into tail section and flue gas is rapidly heated section, when through sinter bed, and the zone sintering bed of material is rich in there is iron system many
Oxide, while oxygen concentration is relatively low in circulating flue gas (being less than the oxygen concentration in air), the flue gas of sintering process formation contains
There is certain reducing gas, when circulating flue gas passes through sinter bed, NOx is carried out under the catalytic action of iron system polyoxide
Removing；2. head section draw circulating flue gas humidity ratio air high humidity, circulating flue gas pass through sinter bed when resistance
Power is low compared with air, reduces the drag losses that gas passes through sinter bed；3. tail section and flue gas are quickly risen by heat exchanger
The flue gas of temperature section exchanges heat with circulating flue gas, has reclaimed the waste heat of flue gas, has reduced the flue gas temperature into follow-up electrostatic/sack cleaner
Degree, save to enter in former smoke processing system needs to increase the supplement air at room temperature that sintering flue gas cool-down is used before deduster
Plus energy consumption；4. the part circulation of sintering flue gas reduces the outer discharge capacity of flue gas, reduces the load of follow-up flue gas purification system；
5. it is rapidly heated to tail section and flue gas in the corresponding bellows in section region and sprays into liquefied ammonia, makes full use of the region denitrating flue gas temperature
Window, further denitration under catalytic action of the particulate matter rich in iron system polyoxide, saves the equipment investment of denitration in flue gas
And the input of denitrating catalyst；6. igniting section sintering flue-gas temperature is relatively low, if master can be reduced by being directly mixed in the flue gas of flue collector
Flue gas in flue temperature, is unfavorable for creating favourable denitration environment, therefore consider this partially sintering bellows of the flue gas through lower section
Electrostatic/sack cleaner is sent into together after mixing with the sintering flue gas in flue collector again through head igniting section flue after collection to remove
Dirt.By by the flue gas of different zones according to the different dual treatment of its feature exactly important inventive point of the application.
Tail section to flue gas is rapidly heated in the bellows below section region, and flue-gas temperature is higher (to meet the thermotonus of denitration
Condition), and sintering dust contained flue gas concentration in bellows also highest (containing a large amount of ferrous oxides), sintering flue gas is in bellows
Residence time it is also longer, liquefied ammonia is now sprayed into bellows, using the dust in flue gas rich in ferrous oxide multicomponent have
Some denitration catalyst effects, and temperature is at 300 DEG C or so, (denitration temperature window) waste heat for realizing sintering dust and flue gas fills
Divide the purpose using simultaneously synchronous denitration.And because the sintering flue gas in bellows is the first step of fume treatment, spray into here
Liquefied ammonia, even if can not consume completely, can also continue generation denitration anti-during the conveying of follow-up flue collector, follow-up dedusting etc.
Should, expand the use function of existing apparatus.
Further, the ammonia spray nozzle ejiction opening in bellows is tilted upward, and its purpose has three：(1) liquefied ammonia and its vapour are made
Change the ammonia formed inversely to contact with sintering flue gas, improve the mixed effect of ammonia and sintering flue gas；(2) most of liquefied ammonia meeting
On the double-edged fine-toothed comb for spraying to chassis bottom surface, and dust content is high in the zone sintering flue gas, and temperature is just in SCR denitration temperature window
Mouthful, denitration effect is optimal；(3) fraction liquefied ammonia can enter in the sintering deposit bed material of pallet bottom through double-edged fine-toothed comb gap, directly exist
Occur catalytic-reduction denitrified reaction with the NOx in flue dust under the catalytic action of ferrous oxide contained by bed material, further improve
Denitration effect.It is therefore preferable that the ammonia spray nozzle is located at the epimere of the bellows, the ammonia spray nozzle can set one layer or many
Layer, every layer uniform multiple, to ensure that ammoniacal liquor is uniformly mixed with sintering flue gas.
Beneficial effect：
(1) flue gas of sintering machine different zones is introduced between different flues and carries out dual treatment, taken full advantage of
The flue dust temperature that rear of sintering machine section and flue gas are rapidly heated in section region lower section correspondence bellows is high, and flue dust dustiness is big, is rich in
Iron system polyoxide, liquefied ammonia is sprayed into bellows, realizes the online denitration of flue gas, and firing chamber needs supplement when saving SCR denitration
External heat source and catalyst；
(2) flue gas recirculation of the high NOx concentration of head section enters tail section and flue gas is rapidly heated section, through sinter bed
When, the zone sintering bed of material is rich in there is iron system polyoxide, while oxygen concentration is relatively low in circulating flue gas (is less than the oxygen in air
Gas concentration), the flue gas of sintering process contains certain reducing gas, and when circulating flue gas passes through sinter bed, in iron, system is polyoxygenated
NOx is removed under the catalytic action of thing；
(3) head section draw circulating flue gas humidity ratio air high humidity, circulating flue gas pass through sinter bed when
Resistance is low compared with air, reduces the drag losses that gas passes through sinter bed；
(4) flue gas and the circulating flue gas heat exchange for the section that tail section and flue gas is rapidly heated by heat exchanger, have reclaimed higher
The fume afterheat of temperature, reduces the flue-gas temperature of follow-up electrostatic/sack cleaner, saves original system using supplement air pair
Sinter the increased power consumption of flue gas cool-down institute；
(5) the part circulation of sintering flue gas is again introduced into sinter bed, reduces the outer discharge capacity of flue gas, reduces follow-up cigarette
The load of gas cleaning system；
(6) present invention process reaches the purpose of effective denitration on the premise of catalyst is not added outside, makes full use of more than system
Heat, NOx abatement amount 70%, compared with traditional SCR denitration technique, reduction denitration cost 70%, denitration device investment can be reduced
40%, with wide market application foreground.
Brief description of the drawings
Fig. 1-1 is NOx concentration analytical table in 10-23 bellows flue gases；
Fig. 1-2 is NOx concentration analytical table in 24-46 bellows flue gases；
Fig. 2-1 is flue-gas temperature analytical table in 10-23 bellows flue gases；
Fig. 2-2 is flue-gas temperature analytical table in 24-46 bellows flue gases；
Fig. 3 is present invention process flow chart.
Wherein, 1- circulating flue gas cover, 2- sintering machines, 2.1-1 chassis, 3- sinter beds, 3.1- bed materials, 4- liquefied ammonia
Nozzle, 5- liquefied ammonia, 6- bellows, 7- flue collectors, 8- circulating flue gas pipeline, 9- circulating flue gas blower fan, 10- heads igniting section
Flue, 11- circulating flue gas heat exchanger, 12- circulating flue gas deduster, 13- circulating flue gas flue collector, 14- electrostatic/bag-type dust
Device, 15- high pressure positive blowers.
Embodiment
Referring to Fig. 1, the present invention includes sintering machine 2, and the lower section of chassis 2.1 of the sintering machine 2 is provided with bellows 6, the bottom of bellows 6
Outlet flue duct, along chassis direct of travel sintering machine be divided into igniting section, head section, flue gas be rapidly heated section and
4 regions of tail section, tail section to flue gas is rapidly heated in the bellows 6 below section region and is respectively arranged with liquefied ammonia nozzle 4；It is described
Flue includes flue collector 7, circulating flue gas flue collector 13 and head igniting section flue 10, and the tail section and flue gas quickly rise
The outlet flue collector 13 of bellows 6 below temperature section, tube side or shell side of the outlet through circulating flue gas heat exchanger 11 of flue collector 13
Connect electrostatic/sack cleaner 14；Bellows 6 below the head section are exported to be removed through circulating flue gas flue collector 13 through circulating flue gas
Dirt device 12, the shell side of circulating flue gas heat exchanger 11 or tube side, the circulation of the top of the connection of circulating flue gas pipeline 8 sintering pallet 2.1
Flue gas cover 1, the circulating flue gas cover 1 is arranged on directly over sintering machine 2, and covering rear of sintering machine section and flue gas are rapidly heated section.
The tail section and flue gas of the sintering machine 2 are rapidly heated below section region and circumferentially install at least one layer of liquefied ammonia on the side wall of bellows 6
Nozzle 4, preferably liquefied ammonia nozzle 4 are tilted upward, and liquefied ammonia 5 is sprayed on the bottom double-edged fine-toothed comb of chassis 2.1, are made liquefied ammonia emission direction and flue gas
Flow direction on the contrary, or two directions angle be more than 90 degree.
With certain steel mill 450m2Exemplified by the sintering fume treatment that sintering machine is produced, mixed flue gas (section containing igniting, head section, cigarette
Gas be rapidly heated section and tail section 4 regions) NOx content be 264mg/m3, 120-200 DEG C of flue-gas temperature, using the present invention
The step of method, is as follows：
Sinter flue gas and pass through sinter bed 3, bed material 3.1, the bottom of sintering pallet 2.1 under the draft effect of high pressure positive blower
Double-edged fine-toothed comb, the bellows 6 of the lower section of chassis 2.1 enter flue, and sintering machine 1 is divided into igniting along the direct of travel of chassis 2.1
Section, head section, flue gas be rapidly heated section and tail section 4 regions, igniting section be located at sintering machine foremost, the region accounts for 1-2
Individual bellows；Head section is located at the sintering machine first half after igniting section and extended in the middle part of sintering machine, and it is total that the region accounts for sintering machine
The 35-45% of length；Flue gas is rapidly heated section positioned at sintering machine middle part tail direction partially, and the region accounts for 2-4 bellows；Machine
Endpiece is located at the latter half of of sintering machine, and the region accounts for the 35-45% of sintering machine total length；Tail section sintering flue-gas temperature ＞
200 DEG C, NOx concentration ＜ 100mg/Nm3；Flue gas be rapidly heated section sintering 80-200 DEG C of flue-gas temperature, NOx concentration ＞ 100mg/
Nm3；80 DEG C of head section sintering flue-gas temperature ＜, NOx concentration 300mg/Nm3More than；80 DEG C of section of lighting a fire sintering flue-gas temperature ＜, NOx
Concentration ＜ 100mg/Nm3, the flue includes flue collector 7, circulating flue gas flue collector 13 and head igniting section flue 10,
From tail section and flue gas be rapidly heated section region sintering flue gas in the bellows 5 with the liquefied ammonia through the penetrating of liquefied ammonia nozzle 4,
And liquefied ammonia vaporizes the ammonia mixing of formation at high temperature, occurs under the iron system polyoxide catalytic action that sintering flue gas is rich in
Enter flue collector 7 after denitration reduction reaction, then electrostatic/sack cleaner 14 is sent into after the heat exchange cooling of circulating flue gas heat exchanger 11
Subsequent processing is sent into after dedusting；Sintering flue gas from head section passes through circulating flue gas master after being collected through corresponding bellows 6
The dedusting of the feeding circulating flue gas of flue 13 deduster 12, then the sintering flue gas through circulating flue gas heat exchanger 11 and flue collector 7 are changed indirectly
Circulating flue gas cover 1 is sent into through circulating flue gas pipeline 8 after heat heating, because circulating flue gas cover 1 is arranged on directly over sintering machine 2, is covered
Lid rear of sintering machine section and flue gas are rapidly heated section, thus this partially sinter flue gas can correspond to the tail section that enters sintering machine 1 and
Flue gas is rapidly heated section, under the catalytic-reduction denitrified effect for the iron system polyoxide being rich in the sinter bed in the region, follows
Ring flue gas is when through sinter bed, and NOx therein is reduced；The sintering flue gas of the igniting section is collected by corresponding bellows 6
The flue gas lighted a fire in section flue 10 and flue collector 7 through head is directly led out afterwards together to enter in follow-up electrostatic/sack cleaner 14.
Rear of sintering machine section and flue gas are rapidly heated on the side wall of bellows 6 below section region and circumferentially install at least one
The liquefied ammonia nozzle 4 that tilts upward of layer, sprays into liquefied ammonia by nozzle and enters bellows and be vaporized into ammonia and mixed with sintering flue gas, in burning
Tie in flue gas and occur denitration reaction with the NOx in flue gas under the catalytic action rich in iron system polyoxide.The liquefied ammonia tilted upward
Nozzle 4 can be such that liquefied ammonia sprays on pallet bottom double-edged fine-toothed comb, make liquefied ammonia emission direction and sintering flow of flue gas in opposite direction, or two sides
To angle be more than 90 degree.It is preferred that the liquefied ammonia amount sprayed into is by NOx: the NH in flue dust3=1: the mol ratio spray of (1.0-1.05)
Enter.
Sintering flue gas NOx discharge capacity after processing reduces more than 70%.
It is whole without using catalyst using above-mentioned denitrating technique, using containing in the particulate matter in sinter bed and sintering flue gas
There is the denitration catalyst activity of iron system polyoxide, make ammonia and NOx reaction denitrations, reduce denitration device investment, take full advantage of work
Waste heat during skill, compared with traditional SCR denitration technique, reduction denitration cost 70%, reduction denitration device investment 70%.
Claims (7)
1. one kind sintering flue gas recirculation low NOx drainage technique, including sintering flue gas are passed through under the draft effect of high pressure positive blower and burnt
Ramming material layer, bed material, sintering pallet bottom double-edged fine-toothed comb, the bellows below chassis enter flue, will be burnt along chassis direct of travel
Knot machine be divided into igniting section, head section, flue gas be rapidly heated section and tail section 4 regions, igniting section be located at sintering machine most before
End, the region accounts for 1-2 bellows；Head section is located at the sintering machine first half after igniting section and extended in the middle part of sintering machine, should
Region accounts for the 35-45% of sintering machine total length；Flue gas is rapidly heated section positioned at sintering machine middle part tail direction partially, and the region is accounted for
2-4 bellows；Tail section is located at the latter half of of sintering machine, and the region accounts for the 35-45% of sintering machine total length；Tail section sintering
200 DEG C of flue-gas temperature ＞, NOx concentration ＜ 100mg/Nm3；Flue gas be rapidly heated section sintering 80-200 DEG C of flue-gas temperature, NOx is dense
Spend ＞ 100mg/Nm3；80 DEG C of head section sintering flue-gas temperature ＜, NOx concentration 300mg/Nm3More than；Section of lighting a fire sintering flue-gas temperature
80 DEG C of ＜, NOx concentration ＜ 100mg/Nm3, it is characterised in that the flue includes flue collector and circulating flue gas flue collector,
From tail section and flue gas be rapidly heated section region liquefied ammonia and liquefied ammonia of the sintering flue gas in bellows with penetrating in height
The ammonia mixing that the lower vaporization of temperature is formed, occurs denitration reduction under the ferrous oxide catalytic action that sintering soot dust granule thing is rich in
Enter flue collector after reaction；Sintering flue gas from head section passes through circulating flue gas flue collector after being collected through corresponding bellows
Draw, in the circulating flue gas cover above feeding sintering pallet, sinter bed be again introduced under the draft effect of high pressure positive blower,
Participate in sintering process and reduce after denitration to be again introduced into bellows through chassis double-edged fine-toothed comb.
2. flue gas recirculation low NOx drainage technique is sintered as claimed in claim 1, it is characterised in that the circulating flue gas cover peace
Directly over the sintering machine, covering rear of sintering machine section and flue gas are rapidly heated section.
3. flue gas recirculation low NOx drainage technique is sintered as claimed in claim 1 or 2, it is characterised in that the rear of sintering machine
Section and flue gas, which are rapidly heated on the bellows side wall below section region, circumferentially installs at least one layer of liquefied ammonia nozzle, is sprayed into by nozzle
Liquefied ammonia enters bellows and is vaporized into ammonia to be mixed with sintering flue gas, and the catalytic action of iron system polyoxide is rich in sintering flue gas
Denitration reaction occurs for the NOx in lower and flue gas.
4. flue gas recirculation low NOx drainage technique is sintered as claimed in claim 3, it is characterised in that the tail section and flue gas
Liquefied ammonia nozzle ejiction opening on bellows side wall below the section that is rapidly heated is tilted upward, and liquefied ammonia is sprayed on pallet bottom double-edged fine-toothed comb,
Make liquefied ammonia emission direction and sintering flow of flue gas in opposite direction, or the angle in two directions is more than 90 degree.
5. the sintering flue gas recirculation low NOx drainage technique as described in claim any one of 1-4, it is characterised in that the main cigarette
The flue gas that road is drawn is sent into follow-up electrostatic/sack cleaner after cooling through circulating flue gas heat exchanger indirect heat exchange.
6. flue gas recirculation low NOx drainage technique is sintered as claimed in claim 5, it is characterised in that the flue is also wrapped
Head igniting section flue is included, the sintering flue gas from the igniting section is directly led out through head point after being collected by corresponding bellows
Fiery section flue enters in follow-up electrostatic/sack cleaner.
7. flue gas recirculation low NOx drainage technique is sintered as claimed in claim 5, it is characterised in that from the main cigarette of circulating flue gas
The sintering flue gas in road first enters what circulating flue gas heat exchanger was introduced with circulating flue gas flue collector after circulating flue gas deduster dedusting
Circulating flue gas cover is sent into after flue gas indirect heat exchange.
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| CN108159861A (en) * | 2017-12-18 | 2018-06-15 | 中南大学 | A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission |
| CN112569758A (en) * | 2019-09-27 | 2021-03-30 | 江苏集萃冶金技术研究院有限公司 | Online denitration process for sintering flue gas |
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| CN112569758B (en) * | 2019-09-27 | 2022-08-23 | 江苏集萃冶金技术研究院有限公司 | Online denitration process for sintering flue gas |
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